Grinding compound



Patented A r. 26, 1932 UNITED STATES PATENT OFFICE RIOHARD S.MCGLAUGHRY, OF WHITING, INDIANA, ASSIGNOR TO STANDARD OIL COM- iPANY, FWRITING, INDIANA, A

CORPORATION OF INDIANA GRINDING COMPOUND No Drawing.

This invention relates to grinding compounds suitable for useinpreparing surfaces of high pressure apparatus, valves of internalcombustion engines and similar purposes.

According to the present invention the grinding compound contains anabrasive, a wax, mineral oil and alkali sulfates derived fromoils'preferably mineral oil. The grinding compounds may, if desired,include small quantities of water and soap and may be reduced inconsistency to the desired extent by the addition of a small quantity ofmineral oil of low viscosity.

I have further discovered that grinding compounds are greatly improvedwith respect to the speed; of grinding and also with respect to thefinish obtained, by using a I plurality of abrasives of differentdegrees of a small quantity hardness, the softer abrasives being used inthe form of relatively coarse particles and the harder abrasives beingused in relatively fine state.

It is preferred to use preferentially oil soluble sulfonates derivedfrom mineral oil. These sulfonates may be produced by adding of alkalito acid treated petroleum oil after withdrawal of sludge and extractingwith dilute alcohol or acetone, in the manner described in Humphrey'sPatent No. 1,286,179. Alkali sulfonates derived from other oils, andpreferentially water soluble sulfonates derived from mineral oils As thewax it is preferred to employ petrolatum, for example, a petrolatum of amelting point about 110 F. or higher. Other solid waxes may be used ifdesired; for example, paraffin wax.

As the abrasive it is preferred to employ carborunduln in finely dividedform. Other abrasives may, however be employed, if desired. Where a hardand a somewhat softer abrasive are employed, it is preferred to employcarborundum and emery. The size of r the abrasive particles may varyconsiderably Application filed January 12, 1928. Serial No. 246,392.

Ewample Alkali compounds of preferentially oil er soluble sulfonic acidsderived from cent mineral oil sulfonates 50% oil) 30 work for which thei Petrolatum (melting point 116 F.) 30

Carborundum (150220 mesh) 30 Fatty acid soap 3 lVater 0. 5

Straw oil 3.5

Ewample II Alkali compounds of preferentially oil soluble sulfonic acidsPer derived from mincent eral oil (sulfonates 50% oil 50%) 30 Petrolatum(melting point 116 F.) 30 Carborundum (150-220 mesh) 30 Emery (80-100mesh) 10 The grinding compounds according to the present invention areremarkably efiective in operation. The compounds have a considerabletendency to remain on the grinding surface. They have a poor lubricatingvalue and are sufficiently viscous to prevent the separation of theabrasive. They may be easily applied to the work and spread over thegrinding surface and can be readily removed.

Where a coarse abrasive is used, as in Example II, a good consistencycan be obtained without the use of soap. Carborundum is not suitable foruse as the coarser abrasive because it scratches the surface and isineffective for accurate work. The relatively coarse emery is notobjectionable on this ac- I count, but on the other'hand it is not hardenough to make rapid grinding possible. The combination of the coarserelatively softer abrasive with the fine hard abrasive permits thehighly important results of rapid grinding and highly satisfactoryfinish.

Although the present invention has been described in connection With thedetails of a specific embodiment thereof, it is not in-' tended thatsuch details'shall be regarded as limitations upon the scope of theinvention, except in so far as included in the accompanying claims. I

I claim:

' 1. -A grinding composition comprising an abrasive, alkali sulfonatesderived from oils, and wax.

14. A grinding compound comprising 15% of alkall compounds ofpreferentially oil soluble sulfonic acids derived from mineral oil, 15%oil, 30% petrolatum, 30% of carborundum of 150 to 220 mesh, and 10% ofemery of 80 to 100 mesh. I

In testimony whereof I have hereunto 'set my hand this 5th day ofJanuary, 1928.

' RICHARD S. McCLAUGI-IRY.

2. A grinding compound comprising an abrasive, alkali compounds ofpreferentially oil soluble sulfonates derived from mineral oils, andwax.

3. A grinding compound comprising an abrasive, alkali compounds ofpreferentially oil soluble sulfonates derived from mineral oils, andpetrolatum.

4. A grinding compound comprising an abrasive, alkali sulfonates derivedfrom oils, wax, and oil.

5. A grinding compound comprising an abrasive, alkali compounds ofpreferentially oil soluble sulfonic acids derived from mineral oil, wax,and oil.

6. A grinding compound comprising an abrasive, alkali compounds ofpreferentially oil soluble sulfonic acids derived from min-- a fine hardabrasive, and a relatively coarser and somewhat softer abrasive.

11. A grinding compound comprising alkali sulfonates derived from oils,wax, finely divided carborundum, and somewhat coarseremery.

12. A grinding compound comprising alkali compounds of'preferentiallyoil soluble sulfonic acids derived from mineral oil, wax, finely divided'carborundum, and somewhat coarser emery.

I 13. A'grinding compound comprising alkali sulfonates derived fromoils, wax, carborundum of about 150 to 220 mesh, and emery of about to100 mesh.

in I

